Synchronous rectifier control for synchronous boost converter -> Monitor Keywords

Site News |

Monitor Keywords |

Monitor Archive |

Organizer |

Account Info |

10/02/08 - USPTO Class 363 | 70 views | #20080239774 | Prev - Next | About this Page

Synchronous rectifier control for synchronous boost converter

Title: Synchronous rectifier control for synchronous boost converter

Brief Patent Description - Full Patent Description - Patent Claims

The Patent Description & Claims data below is from USPTO Patent Application 20080239774, Synchronous rectifier control for synchronous boost converter.

1. A synchronous boost DC/DC conversion system, comprising: an input for receiving a DC input voltage, to which an inductor is coupled, an output for producing a DC output voltage, a power switch controllable to adjust an output signal of the conversion system, a synchronous rectifier configurable to provide a conduction path between the inductor and the output, and a control circuit for controlling the synchronous rectifier as the input voltage approaches or exceeds the output voltage, so as to adjust average impedance of the conduction path over a discharge period of the inductor.

2. The system of claim 1, wherein the control circuit is configured to continuously reduce the average impedance as the input voltage approaches the output voltage.

3. The system of claim 1, wherein the control circuit is configured to incrementally reduce the average impedance as the input voltage approaches the output voltage.

4. The system of claim 1, wherein the control circuit is configured to adjust the average impedance in accordance with a difference between the output voltage and the input voltage.

5. The system of claim 1, wherein the control circuit is configured to adjust the average impedance in accordance with a conduction period of the power switch.

6. The system of claim 1, wherein the synchronous rectifier comprises a synchronous switch provided between the inductor and the output.

7. The system of claim 6, wherein the control circuit is configured to gradually reduce a conduction period of the synchronous switch as the input voltage approaches the output voltage.

8. The system of claim 6, wherein the synchronous switch contains a MOS element.

9. The system of claim 8, wherein the control circuit is configured to gradually decrease a magnitude of a gate-to-source voltage of the MOS element as the input voltage approaches the output voltage.

10. The system of claim 2, wherein the control circuit is configured to supply a pulse-width modulation (PWM) signal to the synchronous switch so as to reduce a conduction period of the synchronous switch as the input voltage approaches the output voltage.

11. The system of claim 10, wherein the synchronous switch is connected in parallel to a shunting element having impedance higher than impedance of the synchronous switch in a conduction state.

12. The system of claim 10, wherein the synchronous switch includes a P-channel MOSFET element having a gate configured for receiving the input voltage during a reset portion of a switching cycle to provide reverse voltage in order to reset current flowing through the inductor.

13. The system of claim 10, wherein the control circuit comprises a pulse width modulator for producing the PWM signal having a duty cycle variable with a threshold voltage.

14. The system of claim 13, wherein the threshold voltage corresponds to a difference between the input voltage and the output voltage.

15. The circuit of claim 14, wherein the threshold voltage is proportional to a difference between the input voltage and a sum of the output voltage and a first offset voltage.

16. The system of claim 14, wherein the control circuit comprises a transconductance amplifier for generating output current proportional to the threshold voltage.

17. The system of claim 14, wherein the pulse width modulator comprises a comparator for comparing a sawtooth signal with a signal corresponding to the threshold voltage to produce a signal for controlling the synchronous rectifier.

18. The system of claim 1, wherein the control circuit comprises multiple switching elements controllable in accordance with a difference between the output voltage and the input voltage.

19. The system of claim 18, wherein the control circuit is configured to control the switching elements in accordance with data in a look-up table containing control values corresponding to predetermined differences between the output voltage and the input voltage.

20. The system of claim 1, wherein the control circuit is configured to disable the synchronous rectifier for duration of time corresponding to a conduction period of the power switch.

21. The system of claim 20, wherein the control circuit is configured to disable the synchronous rectifier for a duration of time proportional to a difference between the conduction period of the power switch and a pre-set time period.

22. A method of converting a DC input voltage into a DC output voltage using a power switch, inductor and a synchronous rectifier, the method comprising the steps of: controlling the power switch to adjust the output voltage, and as the input voltage approaches the output voltage, adjusting average impedance of the synchronous rectifier over a discharge period of the inductor.

23. The method of claim 22, wherein the average impedance is adjusted in accordance with a difference between the output voltage and the input voltage.

24. The method of claim 22, wherein the average impedance is adjusted in accordance with a conduction period of the power switch.

25. The method of claim 22, wherein the average impedance is adjusted so as to continuously reduce the average impedance as the input voltage approaches the output voltage.

26. The method of claim 22, wherein the average impedance is adjusted so as to incrementally reduce the average impedance as the input voltage approaches the output voltage.

27. The method of claim 22, wherein the average impedance is adjusted so as to reduce a conduction period of the synchronous rectifier as the input voltage approaches the output voltage.

28. The method of claim 22, wherein the average impedance is adjusted by providing PWM control of the synchronous rectifier.

Brief Patent Description - Full Patent Description - Patent Claims

Click on the above for other options relating to this Synchronous rectifier control for synchronous boost converter patent application.

Patent Applications in related categories:

20090285003 - Boost converter - In a boost converter including an input transistor receiving an input voltage, an inductor and a main switch serially connected to the input transistor, rectifying means connected to a node between the inductor and the main switch and smoothing means for smoothing the output of the rectifying means to generate ...

20090285002 - Mains converter for switching, without any interruption, between clocked voltage-regulated operation and fundamental-frequency unregulated operation, and method for switching a converter such as this without any interruption - A current source inverter is disclosed, comprising: means for operating the inverter in fundamental frequency unregulated operation, means for operating the inverter in clocked voltage regulated operation, means for recording parameters from which conclusions can be drawn at an instantaneous operating point and/or at an instantaneous network condition, means for ...

###

How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.
Start now! - Receive info on patent apps like Synchronous rectifier control for synchronous boost converter or other areas of interest.
###

Previous Patent Application:
Switched capacitor converters
Next Patent Application:
Voltage converter capable of correctly enabling secondary converting module coupled to output port of voltage converter by utilizing slope indication signal having different pulse amplitudes representative of different slope values
Industry Class:
Electric power conversion systems

###

Design/code © 2009 FreshContext LLC/Freshpatents.com. Website Terms and Conditions - Also read: About this Page
Patent data source: patents published by the United States Patent and Trademark Office (USPTO)
Information published here is for research/educational purposes only (and in conjunction with our Keyword Monitor) and is not meant to be used in place of the full USPTO patent document/images or a comprehensive patent archive search. Complete official applications are on file at the USPTO and often contain additional data/images (Freshpatents is currently text-only). FreshPatents.com is not affiliated with or endorsed by the USPTO or firms/individuals or products/designs/ideas related to listed patents.

FreshPatents.com Support
Thank you for viewing the Synchronous rectifier control for synchronous boost converter patent info.
IP-related news and info

Results in 0.19193 seconds

Other interesting Feshpatents.com categories:
Medical: Surgery , Surgery(2) , Surgery(3) , Drug , Drug(2) , Prosthesis , Dentistry 174

* Protect your Inventions
* US Patent Office filing

Provisional Patent
Utility Patent

PATENT INFO